Malicious PDF — malware analysis report

Static analysis result for SHA-256 6414f9236f1ff87e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 19:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 423148730a514083d6f9d96bcacc1646 SHA-1: 570535bb1250760ea3c6e80b2b876ea01f53d67c SHA-256: 6414f9236f1ff87eb264a14e96b834d347a2cc2968cdf58c8db185cc3fadfb59
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/award?keyword=8th+grade+spelling+bee+words+pdf PDF link annotation
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/tajex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497372/normal_5fdd59e37367b.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/8ac49968.pdfIn PDF document text
    • http://mezoterilijixa.22web.org/krajowa_informacja_skarbowa_bielsko_biaa_nip.pdfIn PDF document text
    • http://xejevojesinil.22web.org/list_of_commonly_used_english_words_with_meaning.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/totazosenepokovozale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5ffc6bf8ab97e.pdfIn PDF document text
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/tawojuwigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_600b9386ccdf3.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/vefen-bowuliziluke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_5fda6c1e7e733.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/wujazinizitadejudeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_60616a44e0032.pdfIn PDF document text
    • https://vewavuxusiwidew.weebly.com/uploads/1/3/4/5/134587075/xekejevasawur-severowiwukanup.pdfIn PDF document text
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/5731787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedure/mawarekoluzibunediwara.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/vocabulary_workshop_level_e_unit_7_set_b_completing_the_sentence.pdfIn PDF document text
    • http://lifosodutevofa.epizy.com/31024234090.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/what_is_the_best_alternative_to_windows_media_player.pdfIn PDF document text
    • http://ruraduwajisiv.rf.gd/apple_music_auto_library.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/autocad_2017_student_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86fb3ef-f475-4f58-8ba3-645258976dad/8_habits_of_highly_effective_google_managers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0db85c-c861-4bed-9eab-8d1da7310e7f/is_boston_market_open_on_christmas.pdfIn PDF document text
    • http://xetorofowuwid.epizy.com/58591843217.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 5632 bytes
SHA-256: b0b3b66ffcb98b4aeb60d4009e7ee51dcf52c0713d7690b7808e4d26feef7a58
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 10660 bytes
SHA-256: adc6802d493effdd16fc832f2a3833ad581802613901163cfeb9eb6415af87e1